Revert 221580 "Make AppShimHostManager a RefCountedThreadSafe."

trunk/src/apps/app_shim/app_shim_host_manager_mac.mm

Index: trunk/src/apps/app_shim/app_shim_host_manager_mac.mm
===================================================================
--- trunk/src/apps/app_shim/app_shim_host_manager_mac.mm	(revision 221792)
+++ trunk/src/apps/app_shim/app_shim_host_manager_mac.mm	(working copy)
@@ -31,7 +31,8 @@
   apps::AppShimHandler::SetDefaultHandler(&extension_app_shim_handler_);
   BrowserThread::PostTask(
       BrowserThread::FILE, FROM_HERE,
-      base::Bind(&AppShimHostManager::InitOnFileThread, this));
+      base::Bind(&AppShimHostManager::InitOnFileThread,
+          base::Unretained(this)));
 }
 
 AppShimHostManager::~AppShimHostManager() {
@@ -51,7 +52,8 @@
   factory_.reset(new IPC::ChannelFactory(socket_path, this));
   BrowserThread::PostTask(
       BrowserThread::IO, FROM_HERE,
-      base::Bind(&AppShimHostManager::ListenOnIOThread, this));
+      base::Bind(&AppShimHostManager::ListenOnIOThread,
+          base::Unretained(this)));
 }
 
 void AppShimHostManager::ListenOnIOThread() {